| Historically, the different networks that
together make up the Internet were grouped into tiers. A Tier1 was
one of the original backbone networks, a Tier2 was a network connected
to Tier1 and so on.
The growth of the Internet and the resultant increased mesh-ed-ness
of all the networks involved means that traditional tier classifications
are less meaningful.
The tools on this site already involve the collection of large
amounts of routing information and this led us to develop an algorithm which
assesses the number of visible peering relationships, the number of
routes passing across a network and the spread of routing across each of
the peering sessions.
While we have not implemented a publicly recognized algorithm, the
results score each network between zero and several trillions, giving us
this ordered table of all visible Autonomous Systems.
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